(from preface)The ebook of this quantity happens within the shadow of the unexpected and unforeseen loss, to the Advances in Catalysis, of 2 of its widespread founders, and, to the realm, of 2 loved participants of the neighborhood of scientists, Dr. W. G. Frankenburg and Dr. V. I. Komarewsky. it sort of feels applicable to show again to the Preface of quantity I of the Advances, and to check the perspectives and hopes which the editors expressed one decade in the past in regards to the prestige of the catalytic technological know-how and the position which they visualized for the then new-born publication.In viewing the scope of data referring to catalytic phenomena they famous the dominance of empirical strategy in catalysis, and expressed the view that ''a technological know-how of catalysis needs to be erected on foundations which nonetheless need to be laid.'' They visualized the Advances as serving as a hyperlink and aspect of focus of a few of the main major advancements in wisdom of catalysis which then was once ''scattered all through a number of journals and handbooks, masking the diversity from theoretical physics to descriptions of business plants.''

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6 in the adsorbed state. These workers studied the spectra of methane, ethylene, acetylene, and hydrogen on porous glass. They found that the perturbing effects of surface forces made it possible to detect bands which are found in the Raman spectra but are not observed in the normal infrared spectra. This indicates that the degree of symmetry of the adsorbed molecule is less than in the gaseous state because of the "one-sided" nature of the surface forces. This effect was discovered independently by Karagounis and Peter ( 5 .

1. 8 p are due to ammonia coordinately bonded t o the aluminum chloride rather than adsorbed on the alumina. The failure to detect the NH3 symmetrical deformation band for ammonia chemisorbed on cracking catalysts is disappointing because the position of this band is strongly influenced by bonding of the nitrogen to other atoms and its position might provide direct evidence on the relative acid strength of different catalysts. WATERAND SURFACE HYDROXYL GROUPS IV. SPECTRAOF ADSORBED ON NONACIDIC OXIDES 1.

INFHARFX) SPECTIZA OF I’HYSICALLY ADsoIzmm MOLECULES Most of the work discussed in connection with the shift of the surface OH bands concerned systems in which physical adsorption occurred. In this work the spcctra of the adsorbed molecules were not emphasized. In 42 R. '1 EISCHENM A N D W. A . PLISKIN some cases the spectrum of the adsorbed molecule was not observed or, if observed, could not be differentiated from that of the liquid state. I n other cases, small differences could be observed in the spectrum of the physically adsorbed molecules.